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ASoC: Intel: avs: Use lookup table to create modules

Message ID 20220722111959.2588597-1-amadeuszx.slawinski@linux.intel.com
State Accepted
Commit 1e744351bcb9c4cee81300de5a6097100d835386
Headers show
Series ASoC: Intel: avs: Use lookup table to create modules | expand

Commit Message

Amadeusz Sławiński July 22, 2022, 11:19 a.m. UTC 
As reported by Nathan, when building avs driver using clang with:
  CONFIG_COMPILE_TEST=y
  CONFIG_FORTIFY_SOURCE=y
  CONFIG_KASAN=y
  CONFIG_PCI=y
  CONFIG_SOUND=y
  CONFIG_SND=y
  CONFIG_SND_SOC=y
  CONFIG_SND_SOC_INTEL_AVS=y

there are reports of too big stack use, like:
  sound/soc/intel/avs/path.c:815:18: error: stack frame size (2176) exceeds limit (2048) in 'avs_path_create' [-Werror,-Wframe-larger-than]
  struct avs_path *avs_path_create(struct avs_dev *adev, u32 dma_id,
                   ^
  1 error generated.

This is apparently caused by inlining many calls to guid_equal which
inlines fortified memcpy, using 2 size_t variables.

Instead of hardcoding many calls to guid_equal, use lookup table with
one call, this improves stack usage.

Link: https://lore.kernel.org/alsa-devel/YtlzY9aYdbS4Y3+l@dev-arch.thelio-3990X/T/
Link: https://github.com/ClangBuiltLinux/linux/issues/1642
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Reported-by: Nathan Chancellor <nathan@kernel.org>
Build-tested-by: Nathan Chancellor <nathan@kernel.org>
---
 sound/soc/intel/avs/path.c | 54 ++++++++++++++++++++------------------
 1 file changed, 29 insertions(+), 25 deletions(-)

Comments

Cezary Rojewski July 22, 2022, 11:28 a.m. UTC | #1 
On 2022-07-22 1:19 PM, Amadeusz Sławiński wrote:

...

> Instead of hardcoding many calls to guid_equal, use lookup table with
> one call, this improves stack usage.
> 
> Link: https://lore.kernel.org/alsa-devel/YtlzY9aYdbS4Y3+l@dev-arch.thelio-3990X/T/
> Link: https://github.com/ClangBuiltLinux/linux/issues/1642
> Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
> Reported-by: Nathan Chancellor <nathan@kernel.org>
> Build-tested-by: Nathan Chancellor <nathan@kernel.org>


Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>

Thanks!
Mark Brown July 22, 2022, 7:39 p.m. UTC | #2 
On Fri, 22 Jul 2022 13:19:59 +0200, Amadeusz Sławiński wrote:
> As reported by Nathan, when building avs driver using clang with:
>   CONFIG_COMPILE_TEST=y
>   CONFIG_FORTIFY_SOURCE=y
>   CONFIG_KASAN=y
>   CONFIG_PCI=y
>   CONFIG_SOUND=y
>   CONFIG_SND=y
>   CONFIG_SND_SOC=y
>   CONFIG_SND_SOC_INTEL_AVS=y
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: Intel: avs: Use lookup table to create modules
      commit: 1e744351bcb9c4cee81300de5a6097100d835386

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark
diff mbox series

Patch

diff --git a/sound/soc/intel/avs/path.c b/sound/soc/intel/avs/path.c
index 3d46dd5e5bc4..ce157a8d6552 100644
--- a/sound/soc/intel/avs/path.c
+++ b/sound/soc/intel/avs/path.c
@@ -449,35 +449,39 @@  static int avs_modext_create(struct avs_dev *adev, struct avs_path_module *mod)
 	return ret;
 }
 
+static int avs_probe_create(struct avs_dev *adev, struct avs_path_module *mod)
+{
+	dev_err(adev->dev, "Probe module can't be instantiated by topology");
+	return -EINVAL;
+}
+
+struct avs_module_create {
+	guid_t *guid;
+	int (*create)(struct avs_dev *adev, struct avs_path_module *mod);
+};
+
+static struct avs_module_create avs_module_create[] = {
+	{ &AVS_MIXIN_MOD_UUID, avs_modbase_create },
+	{ &AVS_MIXOUT_MOD_UUID, avs_modbase_create },
+	{ &AVS_KPBUFF_MOD_UUID, avs_modbase_create },
+	{ &AVS_COPIER_MOD_UUID, avs_copier_create },
+	{ &AVS_MICSEL_MOD_UUID, avs_micsel_create },
+	{ &AVS_MUX_MOD_UUID, avs_mux_create },
+	{ &AVS_UPDWMIX_MOD_UUID, avs_updown_mix_create },
+	{ &AVS_SRCINTC_MOD_UUID, avs_src_create },
+	{ &AVS_AEC_MOD_UUID, avs_aec_create },
+	{ &AVS_ASRC_MOD_UUID, avs_asrc_create },
+	{ &AVS_INTELWOV_MOD_UUID, avs_wov_create },
+	{ &AVS_PROBE_MOD_UUID, avs_probe_create },
+};
+
 static int avs_path_module_type_create(struct avs_dev *adev, struct avs_path_module *mod)
 {
 	const guid_t *type = &mod->template->cfg_ext->type;
 
-	if (guid_equal(type, &AVS_MIXIN_MOD_UUID) ||
-	    guid_equal(type, &AVS_MIXOUT_MOD_UUID) ||
-	    guid_equal(type, &AVS_KPBUFF_MOD_UUID))
-		return avs_modbase_create(adev, mod);
-	if (guid_equal(type, &AVS_COPIER_MOD_UUID))
-		return avs_copier_create(adev, mod);
-	if (guid_equal(type, &AVS_MICSEL_MOD_UUID))
-		return avs_micsel_create(adev, mod);
-	if (guid_equal(type, &AVS_MUX_MOD_UUID))
-		return avs_mux_create(adev, mod);
-	if (guid_equal(type, &AVS_UPDWMIX_MOD_UUID))
-		return avs_updown_mix_create(adev, mod);
-	if (guid_equal(type, &AVS_SRCINTC_MOD_UUID))
-		return avs_src_create(adev, mod);
-	if (guid_equal(type, &AVS_AEC_MOD_UUID))
-		return avs_aec_create(adev, mod);
-	if (guid_equal(type, &AVS_ASRC_MOD_UUID))
-		return avs_asrc_create(adev, mod);
-	if (guid_equal(type, &AVS_INTELWOV_MOD_UUID))
-		return avs_wov_create(adev, mod);
-
-	if (guid_equal(type, &AVS_PROBE_MOD_UUID)) {
-		dev_err(adev->dev, "Probe module can't be instantiated by topology");
-		return -EINVAL;
-	}
+	for (int i = 0; i < ARRAY_SIZE(avs_module_create); i++)
+		if (guid_equal(type, avs_module_create[i].guid))
+			return avs_module_create[i].create(adev, mod);
 
 	return avs_modext_create(adev, mod);
 }